Fluorescence is a characteristic of ________

A) dark nebulae
B) planetary nebulae
C) emission nebulae
D) blue nebulae
E) reflection nebulae


C

Environmental & Atmospheric Sciences

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Tropical forests are being deforested mostly as a result of

A. sustainable small-scale farming and raising of cash crops. B. cattle ranching and commercial logging. C. CITES. D. ecotourism. E. capital to pay off governmental debt.

Environmental & Atmospheric Sciences

On average, the water equivalent of 25.4 cm of snow is about how many centimetres of water?

A. 6.35 cm B. 5.08 cm C. 2.54 cm D. 1.27 cm

Environmental & Atmospheric Sciences

A main difference between gravitational and electric forces is that electrical forces

A) attract. B) repel or attract. C) obey the inverse-square law. D) act over shorter distances. E) are weaker.

Environmental & Atmospheric Sciences

Tides are principally caused by

A) friction. B) Earth's revolution of the Sun. C) gravity. D) velocity.

Environmental & Atmospheric Sciences